Opus incertum — Incertum In*cer tum, a. Doubtful; not of definite form. [1913 Webster] {Opus incertum} (Anc. Arch.), a kind of masonry employed in building walls, in which the stones were not squared nor laid in courses; rubblework. [1913 Webster] … The Collaborative International Dictionary of English

Opus incertum — Layers of opus incertum on the left side of the Temple of Iovis Anxur in Terracina, Italy. Opus incertum was an ancient Roman construction technique, using irregular shaped and random placed uncut stones or fist sized tuff blocks inserted in a… … Wikipedia